| 固化废弃软黏土的强度特性及水稳定性研究 |
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| 引用本文： | 易昕政,骆睿栋,高游,于海浩,铁宁,姚梦晗.固化废弃软黏土的强度特性及水稳定性研究[J].硅酸盐通报,2022,41(3):976-984. |
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| 作者姓名： | 易昕政 骆睿栋 高游 于海浩 铁宁 姚梦晗 |
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| 作者单位： | 1.宁波大学土木与环境工程学院,宁波 315000;2.广西岩土力学与工程重点实验室,桂林 541004 |
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| 基金项目： | 国家级大学生创新创业训练项目(202111646002)；;宁波市科技计划(2019B10048)；;广西自然科学基金(2019GXNSFAA245025)； |
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| 摘 要： | 为了提高水泥和粉煤灰固化高含水率废弃软黏土的固化效果,选取水玻璃作为外加剂,吸水性强的生石灰作为分散剂,采用无侧限抗压强度试验、X 射线衍射、扫描电镜试验研究掺量与龄期对固化软黏土水稳定性和强度特性的影响。试验结果表明,3%(质量分数)的水泥、7%(质量分数)的粉煤灰、2%(质量分数)的生石灰与2%(质量分数)的水玻璃复合时能较好提高高含水率软黏土固化后的强度和水稳定性,其强度能达到水泥粉煤灰类基底层最低强度(1 MPa)。在水泥、粉煤灰和水玻璃质量掺量相同情况下,生石灰质量掺入比由0%增加至2%,其强度增大约375 kPa,且有利于后续固化剂的均匀搅拌,说明生石灰的减水和分散效应在固化土中起主导作用。此外,扫描电镜结果显示加入复合固化剂后大集聚体消失,产生大量的片状结构,大孔隙被填充,土体的强度也随之提高。
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| 关 键 词： | 软黏土 固化 无侧限抗压强度 配合比 水稳定性 固化机理 |
| 收稿时间： | 2021-10-15 |
Research on Strength Behavior and Water Stability of Solidified Waste Soft Clay |
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| YI Xinzheng,LUO Ruidong,GAO You,YU Haihao,TIE Ning,YAO Menghan.Research on Strength Behavior and Water Stability of Solidified Waste Soft Clay[J].Bulletin of the Chinese Ceramic Society,2022,41(3):976-984. |
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| Authors: | YI Xinzheng LUO Ruidong GAO You YU Haihao TIE Ning YAO Menghan |
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| Affiliation: | 1. School of Civil and Environmental Engineering, Ningbo University, Ningbo 315000, China;2. Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin 541004, China |
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| Abstract: | In order to improve the effects of cement and fly ash on the solidification of waste soft clay with high water content, sodium silicate and quick lime were selected as additive and dispersing agent, respectively. The unconfined compressive strength test (UCS), X-ray diffraction (XRD), and scanning electron microscope (SEM) were used to research the influences of mixing ratio and age on the water stability, strength behavior, solidification mechanism of solidified waste soft clay. The results show that 3% (mass fraction) cement combined with 7% (mass fraction) fly ash, 2% (mass fraction) quick lime and 2% (mass fraction) sodium silicate significantly improve the strength and water stability of solidified soft clay. The strength of solidified soft clay reaches 1 MPa, and meets the strength requirements of the cement-fly ash base layer. With the same mixing ratio of cement, fly ash and water glass, the mass fraction of quick lime increases from 0% to 2%, and its strength increases about 375 kPa. Adding the quick lime is conducive to the uniform mixing of the other curing agents. It indicates that the water absorption and dispersion effect of quick lime play a vital role in the solidified soil. In addition, SEM images show that after adding the composite curing agent, the large aggregates disappear, a large number of sheet structures generate, the large pores between the particles are filled, and the strength of soft soil is also improved. |
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| Keywords: | soft clay solidification unconfined compressive strength mixing ratio water stability curing mechanism |
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